Assessment of exogenous pigmentation in colourless elastic ligatures

Fernandes, Alline Birra Nolasco; Ruellas, Antônio Carlos de Oliveira; Araújo, Marcus Vinicius Almeida de; Sant’Anna, Eduardo Franzotti; Elias, Carlos Nelson

doi:10.1179/1465313313y.0000000083

Cited by 14 publications

(29 citation statements)

References 11 publications

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“…Analyses of color changes in orthodontic ligatures are usually performed in vitro , 12 - 18 which does not reflect reality. In this study design, clear elastomers are dipped into high-pigmentation fluids and analyzed after a given period of time.…”

Section: Discussionmentioning

confidence: 99%

“…- 18 However, these studies were conducted in vitro , which may not reflect the numerous factors present in the intraoral environment contributing to color change, such as the oral flora, temperature variation, the mechanical effect of brushing and solid and semi-solid food that cause pigmentation. Thus, clinical studies can yield a more realistic analysis of actual color changes taking place in orthodontic material after clinical use 19 …”

Section: Introductionmentioning

confidence: 99%

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Color changes of esthetic orthodontic ligatures evaluated by orthodontists and patients: a clinical study

Kawabata

Dantas

Kato

et al. 2016

Dental Press J. Orthod.

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Objective: To evaluate in vivo changes in the color of esthetic elastomeric ligatures from different manufacturers. Methods: Four widely used commercial brands of elastomeric ligatures were selected and used in 20 adult patients in a split-mouth design. The ligatures were evaluated by orthodontists and patients in a double-blind manner on the day the ligatures were placed (T0) and 30 days after intraoral exposure (T1) by means of a system of staining scores. Groups were compared by Friedman test with p < 0.05. Results: Orthodontists and patients reported similar staining scores (p > 0.05). Results showed that all brands underwent significant staining when exposed to the intraoral environment. Modular-crystal MorelliTM (Sorocaba, SP, Brazil) showed the highest degree of staining with the median reaching the maximum value (3); while the other brands (3M UnitekTM, American OrthodonticsTM and GAC DentsplyTM) showed the median equal to 1 (p < 0.001). A large individual variability in the degree of staining was also found for all brands. Conclusions: All four brands of esthetic ligatures showed significant staining, which appeared to be more pronounced for the MorelliTM brand. Changes in color of the elastomeric ligatures were perceived similarly by patients and orthodontists. The industry needs to improve the color stability of esthetic ligatures.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Color changes of esthetic orthodontic ligatures evaluated by orthodontists and patients: a clinical study

Kawabata

Dantas

Kato

et al. 2016

Dental Press J. Orthod.

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show abstract

“…32 The coffee (G7 Pure Black Instant Coffee; Trung Nguyen, Bac giang, Vietnam) and tea (Yellow Label Tea; Lipton, Hefei, China) solutions were prepared according to the methods used in previous studies. 23 The concentrations were 3 g of coffee powder or one teabag per 100 mL boiling distilled water. 23 Undiluted red wine (Cabernet Sauvignon red wine; Saflam, Yantai, China) was used.…”

Section: Methodsmentioning

confidence: 99%

“…23 The concentrations were 3 g of coffee powder or one teabag per 100 mL boiling distilled water. 23 Undiluted red wine (Cabernet Sauvignon red wine; Saflam, Yantai, China) was used. Twenty aligners (and/or retainers) from each manufacturer were randomly divided into four groups according to the solutions.…”

Section: Methodsmentioning

confidence: 99%

“…20 Studies have reported that PU-based elastomeric ligatures are vulnerable to pigment adsorption from food and drink in the oral cavity. 21, 22, 23 During usage, it is recommended that aligners be removed before eating and drinking. However, studies have reported that patient compliance regarding removable orthodontic appliances is insufficient, 24 and this often is a matter of concern for orthodontists.…”

Section: Introductionmentioning

confidence: 99%

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Colour stabilities of three types of orthodontic clear aligners exposed to staining agents

et al. 2016

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The aim of this study was to evaluate and compare the colour stabilities of three types of orthodontic clear aligners exposed to staining agents in vitro. Sixty clear orthodontic aligners produced by three manufacturers (Invisalign, Angelalign, and Smartee) were immersed in three staining solutions (coffee, black tea, and red wine) and one control solution (distilled water). After 12-h and 7-day immersions, the aligners were washed in an ultrasonic cleaner and measured with a colourimeter. The colour changes (ΔE*) were calculated on the basis of the Commission Internationale de I'Eclairage L*a*b* colour system (CIE L*a*b*), and the results were then converted into National Bureau of Standards (NBS) units. Fourier transformation infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) were conducted to observe the molecular and morphologic alterations to the aligner surfaces, respectively. The three types of aligners exhibited slight colour changes after 12 h of staining, with the exception of the Invisalign aligners stained with coffee. The Invisalign aligners exhibited significantly higher ΔE* values (ranging from 0.30 to 27.81) than those of the Angelalign and Smartee aligners (ΔE* values ranging from 0.33 to 1.89 and 0.32 to 1.61, respectively, P<0.05). FT-IR analysis confirmed that the polymer-based structure of aligners did not exhibit significant chemical differences before and after the immersions. The SEM results revealed different surface alterations to the three types of aligner materials after the 7-day staining. The three types of aesthetic orthodontic appliances exhibited colour stability after the 12-h immersion, with the exception of the Invisalign aligners stained by coffee. The Invisalign aligners were more prone than the Angelalign and Smartee aligners to pigmentation. Aligner materials may be improved by considering aesthetic colour stability properties.

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Effect of oral exposure on chemical, physical, mechanical, and morphologic properties of clear orthodontic aligners

Lira

Vargas

Silva

et al. 2023

American Journal of Orthodontics and Dentofacial Orthopedics

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Assessment of exogenous pigmentation in colourless elastic ligatures

Abstract: The group that changed colour significantly was the one that presented the highest porosity, and the brand that was the least altered was the one that showed the lowest porosity.

Cited by 14 publications

References 11 publications

Color changes of esthetic orthodontic ligatures evaluated by orthodontists and patients: a clinical study

Color changes of esthetic orthodontic ligatures evaluated by orthodontists and patients: a clinical study

Colour stabilities of three types of orthodontic clear aligners exposed to staining agents

Effect of oral exposure on chemical, physical, mechanical, and morphologic properties of clear orthodontic aligners

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